const path = require('path');
const HTMLPlugin = require('html-webpack-plugin');
const VueLoaderPlugin = require('vue-loader/lib/plugin');
const webpack = require('webpack');
//打包拆分css html
const ExtractPlugin = require('extract-text-webpack-plugin');

const isDev = process.env.NODE_ENV === 'development';
const config = {
    target: "web",
    entry : path.join(__dirname, 'src/index.js'),
    output : {
        filename : "bundle.[hash:8].js",
        path : path.join(__dirname, 'dist')
    },
    plugins: [
        new webpack.DefinePlugin({
            'process.env' : {
                NODE_ENV : isDev ? '"development"' : '"production"'
            }
                                 }),
        new VueLoaderPlugin(),
        new HTMLPlugin(),
    ],
    module: {
        rules: [
            {
                test : /\.vue$/,
                use : ['vue-loader']
            },
            {
                test : /\.jsx$/,
                use : ['babel-loader']
            },
            {
                test : /\.(gif|jpg|jpeg|png|svg)$/,
                use : [
                    {
                        loader : 'url-loader',
                        options : {
                            limit : 1024,
                            name: '[name]-d.[ext]'
                        }
                    }
                ]
            }
        ]
    }
};

if (isDev) {
    config.module.rules.push(
        {
            test : /\.styl/,
            use : [
                'style-loader',
                'css-loader',
                {
                    loader: "postcss-loader",
                    options: {
                        sourceMap: true,
                    }
                },
                'stylus-loader'
            ]
        },
    );
    config.devtool = '#cheap-module-eval-source-map';
    config.devServer = {
        port : 8000,
        host : '0.0.0.0',
        overlay : {
            errors : true,
        },
        open : true,
        hot : true
    };
    config.plugins.push(
        new webpack.HotModuleReplacementPlugin(),
        new webpack.NoEmitOnErrorsPlugin()
    );
} else {
    config.entry = {
        app: path.join(__dirname, 'src/index.js'),
        vendor: ['vue']
    };
    config.output.filename = '[name].[chunkhash:8].js';
    config.module.rules.push(
        {
            test : /\.styl/,
            use : ExtractPlugin.extract({
                fallback: 'style-loader',
                use: [
                'css-loader',
                {
                    loader: "postcss-loader",
                    options: {
                        sourceMap: true,
                    }
                },
                'stylus-loader'
            ]
        })}
    );
    config.plugins.push(
        new ExtractPlugin('style.[chunkhash:8].css')
    );
}

module.exports = config;



